Main content area

Nitrate influx in rose plants during day-night cycle

Cárdenas-Navarro, Raúl, Castellanos-Morales, Vilma del Carmen, López-Pérez, Luis, Peña-Cabriales, Juan José, Vargas-De la Cruz, Fidel, Flores-Cortez, Idolina
Journal of plant nutrition 2017 v.40 no.4 pp. 486-491
Rosa, carbohydrates, environmental factors, growth chambers, herbaceous plants, hybrids, hydroponics, nitrates, nitrogen, nutrient film technique, stable isotopes, Texas
In herbaceous plants grown in controlled environmental conditions nitrate (NO ₃⁻) uptake increases during the day and decreases in the night. The aim of this work was to measure NO ₃⁻ uptake rates along the day-night cycle, in rose (Rosa hybrida L.) plants grown under controlled environmental conditions. Two independent experiments were conducted inside a growth chamber at 20 ºC and 25 ºC, using rose mini-plants cv. Texas, grown in a hydroponic nutrient film technique (NFT) set-up with at 3.0 mol m ⁻³ NO ₃⁻ concentration. Dry matter and nitrogen (N) accumulation were registered during growth and NO ₃⁻ uptake rates were measured during a day-night cycle, using ¹⁵N as ¹⁵NO ₃⁻. In both experiments the hourly estimated N-NO ₃⁻ accumulation rates are near to the measured uptake rates of ¹⁵NO ₃⁻ and nitrate uptake decrease during the day and increase in the night, in contrast with the herbaceous plants. Results are discussed on the basis of N plant demand and carbohydrates availability.